The runoff coefficient of a catchment is defined as the ratio of:
Correct answer: B. Runoff volume to rainfall volume
- A. Rainfall volume to runoff volume
- B. Runoff volume to rainfall volume
- C. Infiltration volume to rainfall intensity
- D. Evaporation volume to storage volume
Explanation
The runoff coefficient expresses the fraction of rainfall that appears as runoff, so it is runoff volume divided by rainfall volume for the same event or period. A larger value generally indicates a more impervious or less absorbent catchment.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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